Why was the invasion set for the first week of june 1944 for d-day?

On this day in 1944, now known as D-Day, future President Dwight D. Eisenhower, then supreme commander of Allied Expeditionary Forces in World War II gives the go-ahead for a massive invasion of Europe called Operation Overlord. ... By the first week of June 1944, Nazi Germany controlled most of Western Europe.

the african society basically suffered the consequences of colonization and apartheid directly attacking the black people, first, during the colonialism and its main idea which which "white people" had better rights, affecting   them principally in the right to establish black people in their territories, access to quality education and health services and took away any civil right even to the black people to feel they have the same opportunities as the settlers.